Valve



NOV. 6, 1945. F. HABERLAND f 2,388,406

` VALVE I Filed July l, 1943 Patented Nov. 6, 1945 esatte v-ALVErs. Frederick Haberlanaioievelana, goma'. assigner to This 4.invention relates etolpressure relief Valvesofflfa typesincorporatingA a vvalve yunit L comprisirrgf atwalve t housing' l and valve assembly; removable as a unitlfromf-.thei body l 012the-housinginI which'- Ilidipassages orports are formed.by 5

InapriorvalveV assemblies" of@ theJgeneral-ftypef over which:thepresentvinvention is an` improve-f-`A mentinthe ivalveunit embodiesaaralve4 housingk one1 endlaofowhieh lisvopen touformk a-Mvalve' seatfand` the other end of which is closed to form a dash: 10 potlfchambera The presentiinvention contemplatesfthei formation-of fa bore through .the `main housingand:itheremployment of amovel` auxiliary: valrve" housing closedfl ende performing theadd-ily^ tional useful function of a closure for one-rend'4 1.5v

ofmthe: bodyi-v bore in; whichf the valve@ unit is mountedsr.

Anotherffobiecti. ofl `the` linventi'on @isf to provide= a-ivalveeassemblyeof the gen'eraltypeeindicatedewherein :thetltwoaports .f whichrcornmunicatef with 20 ther va'lyefs unititmayf if i desired. befarrangedeonea: commoneaxisa the;l invention making..tliis`v l possible" byifutilizingstherclosed .end of thc'l valveehusing to `fclose:theiborezin whichI itlis seated'. f

Another. objectnlofntheinvention:is-itc provide* 25 a rvalverassembly fof generaletype Jaindi'ated; wherein theavalve fhousing:V may: bercompletelyli sealed between theetwolports withwhichffitcomfmunicates andcth'e,` bore :firrwvhich it'fis mounted? .liffurtherlF` obiectarisfftol providei 1fo1-such1-a sealV`A 30 without-.increasing theilengt'h of f the yvalvethouse ingp; Theseiobjectsrare attained :byfarrangingforf the morti :ori portsgto icomrnunicatewith-the` oen-w tral fregionfof thewalvefinsteafd-ohthe end region thereofz'asfinsome of the learliestsvalveistructures; 35 andl fbygutilizingfthe ftworrdlregions of 'f'the valve 1 housing.-,as= seatsf=for-fsealingzmeansf sealing -fboth` etuis` on the ivalve-y housing; infith'e"1 bore' fincw-hichi it'isgmouniedf.;A

These? rand; other:V objects .tand/lfeaturesx off/this e inventiorriwilllbecomeiapparent from the following specification when taken together with the accompanying drawing in which:

Fig. 1 is a sectional view through the valve portion of a feathering type gear pump embodying the invention, the balance of the pump being shown in plan; and

Fig. 2 is a longitudinal sectional view of a valve assembly embodying the invention.

The gear pump shown in Fig. lvby way of example of one complete mechanism in which the invention may be embodied, comprises the casing I0 enclosing a suitable pair of rotors (not shown) adapted to draw fluid through an inlet II and deliver it through an outlet I2. The pressure 55 relier valveassembly offmyfinventionisfadaptedi torfestablishi af..bypass fromlzlthe: outlet@ I 2J back; td-.th'eeinlet LI .Ifsi Thefvalve'r assemblyfin'cludes :laA body-1|3 having.E b'orevlliV onerenfdiofiwh'chsliseree:

ducedgtoaformJf-afstopgzshoulder I5.i vIn thef'rew ducedxendvottheiboreiI Ms mountedra -valveunit indicated generally at I6 including a tubular: member: I 1 having-oa'.zreducedawaist: portion .1I 1a andrai slightly: enlarge :.headiportiom I 'Iiblseatedr againsinthe shoulder-:I 5; forlflirnitinglthe outward movementnoftherfinsert memberiwhen subjected." tot pressure..v The :head 1I 'Ibis ,openfito provide'r'a valve.:` seat z l, I rnfaga'inst :whichlsisiseatedaa fvalve propereIS. Aecompression spring-'20 isl'engagedi between; thefyalve'elmenm 9 and a 'cap 2 I' which. isithreade'd: at .22 l'intoitl'ie Vboreal 4;v ThelspringiZf normallyrmaintainslthe vvalveele'ment :I ffagainstf the; seat I 8v 'andlthe:pressurefofthe val-ve 1 element' I9" against :thefseat I8 infturnfmaihtains the head. i 'la seated.r againstthe shoulder.l I 5a` A passage;231connects i the outletcportfIZ 'to an; annular space 24 dened between thelwaist por; tion I'Ia of Vthe:fvalveffhousingazandirthebore I4. Radia1 f apertures 1 '-I 'Ic` inzxthertubular insert' house ing `member or. auxiliary'yalvezhousing I 'I permit' In accordance Withrthe. presenti'inlventionfrtheV ing.:: The valve-element' lfiskprovidedwithva' piston f28 .acting inthe chamberlZ 'I lBy' formingthe -reliefapertures* I1 c! invthe intermediate-region ofA the valvelhousing; it becomes possible -to'l utilizeltheltwcr' axiall-y ilankihg regions' of. theaauxiliary valvehousing I'Iiasl seats forf packing ringsA 29 which seal the auxiliary valve housing to the bore I4 of main housing I0 on both sides of the waist portion I'Ia. Thus the outer lend of the bore I4 is effectively sealed against the escape of fluid therefrom, and the relief passage provided by the Valve is effectively sealed when the Valve is closed.

In the present invention, the closed end 26 of the insert member or auxiliary valve housing I1. serves the new and additional function of closing the terminal of the bore I4. The pressure acting on insert member or auxiliary valve housing Il performs the additional and very valuable function of holding the same in place with the head Upon the occurrence of a selected value of maxi--v normally maintain it against its seat and to maintain the head of said housing engaged against said shoulder, said closed end of the valve housing serving toclose the end of said bore, said housing having, intermediate its ends, an aperture cornmunicating with said port.

2. In combination with a body having a bore therein one end of which is constricted to' form a shoulder therein, said body also having a port communicating with said bore, a unitary valve assembly including a valve housing removably seated in said constricted end of the bore and mum pressure, determined by the adjustment ofv threaded closure plug 2|, the pressure uid acting on the underside of valve I9 will cause this valve to be raised from its seat Ij8 allowing'the pressure fluid to be returned through passage 25 to the pump inlet II. Dash-pot piston 28 functions in the usual manner to control the rate of iioW of uid between the opposite sides thereof in the movement ofthe valve -back and `forth to thus control the rate of such valve` movement and prevent'hunting, as well as allowingthe pressure fluid to act against the closed end of tubular member I'I thus assuring the maintenance of enlarged head IIb in engaged relation with shoulder l5.

In the form of the invention shown in Fig. 2, the alternative construction and arrangement of parts are essentially the same. instead of the single port 2:3 communicating with the Valve unit I6, there is provided a pair of axially aligned ports 23a and 23h communicating respectively with the opposite sides of the valve unit, and instead of the single port 25 communicating with the bore I4, there is provided va pair of axially aligned ports 25a and 25h communicating respectively with the opposite sides of the bore. The axial alignment of the ports.23'a and 23h is made possible by the provision for closing the end of the bore I4 by the closed end of the valve housing.

While I have disclosed my invention in connec- -tion with certain specific embodiments thereof, it is to be understood that these are by way of example rather than limitation, and it is intended that the invention be dened .by the appended claims which should be given a scope as broad as consistent with the prior art.

I claim:

1. In combination with a body having a port therein and having a bore for communication with said port, a valve assembly including a valve housing one end of which is open to provide a valve seat and is formedV with a head seated against a shoulder in said bore, the other end of said valve housing being closed to form a dash pot chamber, a valve element engageable with said seat and having an extension formed with a piston operating in said chamber to form a dash pot, means yieldingly engaging said element to It is noted that having an enlarged portion engaged against said shoulder, one end of said housing being open to deiine a valve seat and the other end being closed to form a dash'pot chamber and also serving to close the endof said bore, a valve element engaged against said seat and having an extension formed with a piston cooperating with said chamber to form a dash pot, means yieldingly maintaining said valve element in engagement with said seat and maintaining said housing in engagement with said shoulder, said housing having an aperture communicating with said bore.

3. A valve assembly as dened in claim 2, wherein said aperture is located intermediate the end portions of said valve housing and said end portions are provided with packing means sealing the same within said bore on both sides of said port.

4. The valve assembly as deiinedin claim 2, wherein said port comprises a pair of axially aligned openings communicating with oppositeV sides of the intermediate region of said valve housing.

5. In combination with a body having a port therein and having a bore in communication with said port, said bore being constricted at one end to dene a shoulder, a unitary valve assembly including a, valve housing removably seated in said bore and engaged 'against said shoulder, the valve housing having end portions sealed to said bore oneither side of said port and an intermediate portion spaced from said bore to define an annular passage communicating with said port,

and having an aperture establishing communications between its interior and said annular pas.

sage, the inner end of said Valve housing being open to dene a valve seat andthe outer end being closed to close said bore, a valve element seated against said valve seat, and means yieldingly urging said valve element against said seat and urging said valve housing against said shoulder.

6. A valve assembly as defined in claim 5, wherein said end portions of the housing are relatively thick and the seals of said end portions comprise annular packing channels in said end portions and wherein at least a por-tion of said annular passage comprises an intermediate waist portion of said housing of reduced diameter.

. FREDERICK HABERLAND. 

